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This work presents results on CO 2  hydrogenation to dimethyl ether (DME) over bifunctional catalysts consisting of In 2 O 3 , supported on natural clay halloysite nanotubes (HNT), and HNT modified with Al-MCM-41 silica arrays. The catalysts were characterized by TEM, STEM, EDX-mapping, NH 3 -TPD, XRD, low-temperature nitrogen adsorption, TPO, and H 2 -TPR techniques. Catalytic properties of In 2 O 3 /HNT and In 2 O 3 /Al-MCM-41/HNT in the CO 2  hydrogenation to DME were investigated in a fixed-bed continuous flow stainless steel reactor at 10–40 atm, in the temperature range of 200–300°C, at GHSV = 12,000 h −1  and molar ratio of H 2 :CO 2  = 3:1. The best catalyst for CO 2  hydrogenation was In 2 O 3 /Al-MCM-41/HNT that provided DME production rate 0.15 g DME ·(g cat ·h) −1  with DME selectivity 53% and at 40 bar, GHSV = 12,000 h −1 , and  T  = 250°C. It was shown that In 2 O 3 /Al-MCM-41/HNT exhibited stable operation for at least 40 h on stream.

CO 2 hydrogenation to dimethyl ether over In 2 O 3 catalysts supported on aluminosilicate halloysite nanotubes